pope benedict has just three days left in office and today in one of his last acts before retiring he changed the church rules so that the election of his successor can begin sooner. whoever that successor is, allen pizzey tells us he will be inheriting a church in turmoil. >> reporter: the pope seems increasingly at peace as he says his last good-byes. but he leaves behind the vatican beset by troubles for the next pope and those who will choose him. today, britain's most senior cleric, scottish cardinal keith o'brien, officially resigned and then took the unprecedented step of opting out of the conclave after he was accused of inappropriate contact with three priests dating back 30 years. o'brien disputes the accusation bus said he didn't want to be the focus of media attention in rome. the news came as the pope accepted a report into what is likely to be his successor's greatest burden. an internal investigation into power struggles and corruptions within the vatican hierarchy. the pope ordered the investigation after his butler was found to have stolen papers off his desk. john th